Driving device and driving method of inkjet head

Abstract

There is provided a controller which sets electrodes which are respectively disposed on wall surfaces of a plurality of ink chambers which are arranged in parallel so as to be separated from each other by partitions made of a piezoelectric material, to a high impedance state. In addition, at a timing when an identical potential is applied to the electrodes of at least three ink chambers which are arranged in parallel so as to be separated from each other by mutually adjacent partitions, the controller sets electrodes of ink chambers other than ink chambers located on both sides to a high impedance state.

What is claimed is: 
     
       1. A driving device of an inkjet head in which electrodes are respectively disposed on wall surfaces of a plurality of ink chambers which are arranged in parallel so as to be separated from each other by partitions made of a piezoelectric material, a potential difference is given to the electrodes of two adjacent ink chambers so as to deform the partitions interposed between the electrodes, and ink is ejected from a nozzle which communicates with the ink chamber having the deformable partitions as wall surfaces, the device comprising:
 a controller that sets the electrodes to a high impedance state, 
 wherein, at a timing when an identical potential is applied to the electrodes of at least three adjacent ink chambers which are arranged in parallel so as to be separated from each other by mutually adjacent partitions, the controller sets electrodes of middle ink chambers other than ink chambers located on both sides of the middle ink chambers to a high impedance state. 
 
     
     
       2. The device according to  claim 1 , wherein, when the ink chambers other than the ink chambers located on both sides of the middle ink chambers include an ink chamber which performs assistance driving without ejecting ink, the controller applies the identical potential to an electrode of the ink chamber which performs the assistance driving. 
     
     
       3. A driving device of an inkjet head in which electrodes are respectively disposed on wall surfaces of a plurality of ink chambers which are arranged in parallel so as to be separated from each other by partitions made of a piezoelectric material, a potential difference is given to the electrodes of two adjacent ink chambers so as to deform the partitions interposed between the electrodes, and ink is ejected from a nozzle which communicates with the ink chamber having the deformed deformable partitions as wall surfaces, the device comprising:
 a controller that sets the electrodes to a high impedance state, 
 wherein, when a potential difference is given to the electrodes of the two adjacent ink chambers, the controller temporarily sets the electrodes to a high impedance state in a section in which the potential difference is held. 
 
     
     
       4. A driving device of an inkjet head in which electrodes are respectively disposed on wall surfaces of a plurality of ink chambers which are arranged in parallel so as to be separated from each other by partitions made of a piezoelectric material, a potential difference is given to the electrodes of two adjacent ink chambers so as to deform the partitions interposed between the electrodes, and ink is ejected from a nozzle which communicates with the ink chamber having the deformable partitions as wall surfaces, the device comprising:
 a controller that sets the electrodes to a high impedance state, 
 wherein, when the two adjacent ink chambers simultaneously perform switching, the controller sets the electrode of at least one ink chamber to a high impedance state immediately before the switching is performed.